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<html lang="zh-cn">
  <head>
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    <title>省市区三级联动菜单</title>
    
  </head>
  <body>
    <h1>联动菜单</h1>
    <div class="container">
  <div class="row">
    <div class="col-sm">
          <div class="input-group mb-3">
  <div class="input-group-prepend">
    <label class="input-group-text" for="province">省</label>
  </div>
  <select class="custom-select" id="province"name="province">
    <option selected>Choose...</option>
    <option value="1">One</option>
    <option value="2">Two</option>
    <option value="3">Three</option>
  </select>
</div>
    </div>
    <div class="col-sm">
       <div class="input-group mb-3">
  <div class="input-group-prepend">
    <label class="input-group-text" for="city">市</label>
  </div>
  <select class="custom-select" id="city"name="city">
    <option selected>Choose...</option>
    <option value="1">One</option>
    <option value="2">Two</option>
    <option value="3">Three</option>
  </select>
</div>
    </div>
    <div class="col-sm">
     <div class="input-group mb-3">
  <div class="input-group-prepend">
    <label class="input-group-text" for="area">县</label>
  </div>
  <select class="custom-select" id="area"name="area">
    <option selected>Choose...</option>
    <option value="1">One</option>
    <option value="2">Two</option>
    <option value="3">Three</option>
  </select>
</div>
    </div>
  </div>
</div>


 

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